diff --git a/operation/finish_install.py b/operation/finish_install.py
index da3ec99..be01aa9 100755
--- a/operation/finish_install.py
+++ b/operation/finish_install.py
@@ -14,7 +14,7 @@ homedir = ri_data.StateGrid.home_dir
 shell = ri_data.StateGrid.shell
 
 # run state grid custom scripts
-f = open('proc/cmdline', 'r')
+f = open('/proc/cmdline', 'r')
 cmdline = f.readline()
 f.close()
 instmode = cmdline.split(' ')[0].split('=')[1]